191862489017 has 2 divisors, whose sum is σ = 191862489018. Its totient is φ = 191862489016.

The previous prime is 191862489001. The next prime is 191862489031. The reversal of 191862489017 is 710984268191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172514791801 + 19347697216 = 415349^2 + 139096^2 .

It is a cyclic number.

It is not a de Polignac number, because 191862489017 - 2⁴ = 191862489001 is a prime.

It is a super-2 number, since 2×191862489017² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (191862489037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95931244508 + 95931244509.

It is an arithmetic number, because the mean of its divisors is an integer number (95931244509).

Almost surely, 2^191862489017 is an apocalyptic number.

It is an amenable number.

191862489017 is a deficient number, since it is larger than the sum of its proper divisors (1).

191862489017 is an equidigital number, since it uses as much as digits as its factorization.

191862489017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 56.

The spelling of 191862489017 in words is "one hundred ninety-one billion, eight hundred sixty-two million, four hundred eighty-nine thousand, seventeen".